Datentypkonvertierung Eine implizite Datenkonvertierung ist in Dialekt 3 nicht möglich — die CAST-Funktion wird fast immer benötigt, um Datentypkonflikte zu vermeiden. In Dialekt 1 wird in vielen Ausdrücken ein Typ CURSOR-Klauseln verwendet werden • Wenn der Cursor nur zum Durchlaufen der Ergebnismenge benötigt wird, ist es fast immer einfacher und weniger fehleranfällig, eine FOR SELECT-Anweisung mit der AS CURSOR-Klausel zu berücksichtigen. Wenn Sie das gleiche Ergebnis mit PSQL und / oder DSQL erzielen können, ist dies fast immer vorzuziehen. Siehe auch FOR EXECUTE STATEMENT 7.7.15. FOR SELECT Verwendet für Zeilenweises

3.10. Conversion of Data Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 3.10.1. Explicit Data Type Conversion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 3.10.2. Implicit Data Type Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. Data Types and Subtypes 57 the same, except that sqldata remains null at all times. 3.10. Conversion of Data Types When composing an expression or specifying an operation, the aim should be to use

3.8. Conversion of Data Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 3.8.1. Explicit Data Type Conversion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 3.8.2. Implicit Data Type Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . translating the Russian text. From him, the raw English text went in stages for editing and DocBook conversion by Helen Borrie — and here is The Firebird SQL Language Reference for V.2.5, by…everyone! … and

335544334 convert_error Conversion error from string "%s" -413 335544454 nofilter Filter not found to convert type %ld to type %ld -413 335544860 blob_convert_error Unsupported conversion to target type BLOB BLOB (subtype %d) -413 335544861 array_convert_error Unsupported conversion to target type ARRAY -501 335544327 bad_req_handle Invalid request handle -501 335544577 dsql_cursor_close_err Attempt to reclose column %s must be at least %d characters. -829 336068817 dyn_invalid_dtype_conversion Cannot change datatype for %s.Conversion from base type %s to %s is not supported. -829 336068818 dyn_dtype_conv_invalid

335544334 convert_error Conversion error from string "@1" -413 335544454 nofilter Filter not found to convert type @1 to type @2 -413 335544860 blob_convert_error Unsupported conversion to target type BLOB BLOB (subtype @1) -413 335544861 array_convert_error Unsupported conversion to target type ARRAY -501 335544577 dsql_cursor_close_err Attempt to reclose a closed cursor -502 336003090 dsql_cursor_redefined column @1 must be at least @2 characters. -829 336068817 dyn_invalid_dtype_conversion Cannot change datatype for @1.Conversion from base type @2 to @3 is not supported. -829 336068818 dyn_dtype_conv_invalid

valeur en réalité représente un NULL, le traite comme tel, et renvoie NULL à l'appelant. Ces deux conversion sont en général non désirées, mais la seconde certainement plus que la première (on préfère valider arguments numériques) et/ou '' (pour les chaînes de caractères). 4. Si la fonction effectue une conversion non désirée de NULL <-> non-NULL , vous devrez en tenir compte dans votre code avant d'utiliser dans Firebird 1.5 qui convertit NULL en quasiment tout ce que l'on veut. Cela permet de faire une conversion à la volée et utiliser le résultat dans le processus, sans utiliser la construction « if (MyExpression

out of bounds -407 335544435 nullsegkey Null segment of UNIQUE KEY -413 335544334 convert_error Conversion error from string "" -413 335544454 nofilter Filter not found to convert type must be at least characters. -829 336068817 dyn_invalid_dtype_conversion Cannot change datatype for . Conversion from base type to is not supported. -829 336068818

and/or '' (for string arguments). 4. If the function performs an undesired NULL <=> non-NULL conversion, you’ll have to anticipate it in your code before calling the UDF (see also Testing for NULL — 5 and higher can convert NULL to most anything else. This enables you to perform an on-the-fly conversion and use the result in your further processing, without the need for “if (MyExpression is null) been created but not initialised is in a NULL state” as second listitem. 1.2 30 Jun 2020 M R Conversion to AsciiDoc, minor copy-editing Removed section FSQL as linked page no longer exists and no alternative

connection. Shared cache space. More efficient if the number of simultaneous connections grows. Permits fast, direct I/O to database files for Linux local connections. On Linux, local connections are made network-style On Windows, this is op- tional; you can also make direct local connections, but these are not as fast as the “Classic” ones on Linux and also less safe. Server must run as root. This poses a risk if the empty line after the CON> prompt and press Enter again. • If you run Classic Server on Linux, a fast, direct local connection is attempted if the database path does not start with a hostname. This may

Null segment of UNIQUE KEY. Null сегмент для уникального ключа. -413 335544334 convert_error Conversion error from string "@1". Ошибка конвертации для строки "@1". Обработка ошибок, коды и сообщения blob_convert_error Unsupported conversion to target type BLOB (subtype @1). Не поддерживается преобразование в целевой тип BLOB (подтип @1). -413 335544861 array_convert_error Unsupported conversion to target type должен быть по крайней мере @2 символов. -829 336068817 dyn_invalid_dtype_conversion Cannot change datatype for @1.Conversion from base type @2 to @3 is not supported. Не могу изменить тип данных для